Gentex Mirror Auto Dimming W/ Temperature & Compass GENK-21

Eliminate dangerous glare from the vehicles traveling behind you with an NVS® rearview mirror. It detects glare and automatically dims to preserve driver vision and make nighttime driving safer. The brighter the glare, the darker the mirror becomes. An ICE indicator will display for one minute when the temperature is at or below 37 degrees. This feature cautions you to anticipate road-icing conditions. Compass and external temperature readouts also ensure that while you are driving safer you are also driving smarter.